M137 5 in 1 Car USB Bluetooth 5.2 Receiver Transmitter 5 in 1: (support calls when receiving) 1. When receiving, the audio can be output to the speaker through the audio cable 2. When receiving, you can directly output audio to the speaker via USB 3. When transmitting, you can input audio to the adapter through the audio cable, and then transmit the audio to the Bluetooth headset 4. Machine or speaker 5. When transmitting, you can input audio to the adapter via USB, and then transmit the audio to the Bluetooth headset or speaker 6. Sound card function: computer USB to 3.5 headphone, convert audio to headphone 3.5 audio output through USB adapter 1. Material: ABS 2. Interface: 3.5mm, USB 3. Transmission rate: 3Mbps 4. Effective working radius: 10m 5. Bluetooth standard: 5.2 6. Working frequency: 2.4MHz 7. Button switch mode, convenient and quick 8. Plug into the car USBAUX port, connect to the Bluetooth of the mobile phone, and listen to songs and navigate hands-free calls. 9. Solve the problem of damage to the original sound card of the computer, and expand the AUX audio interface 10. Driver-free use, plug and play 11. Dimensions: 19x38x11mm 12. Weight: about 18 grams Packing list: - Bluetooth 5.2 audio adapter - 3.5mm audio cable (1m39in) - Manual